Git Rewriting History & Rebase
Git rewriting history refers to altering previous commits in a repository, often to clean up or modify commit messages, combine commits, or remove sensitive information. The rebase command is a common tool for this purpose, allowing developers to move or combine a sequence of commits onto a new base commit. While powerful, rewriting history can disrupt collaboration if not used carefully, especially on shared branches.
Git Rewriting History & Rebase
Git rewriting history refers to altering previous commits in a repository, often to clean up or modify commit messages, combine commits, or remove sensitive information. The rebase command is a common tool for this purpose, allowing developers to move or combine a sequence of commits onto a new base commit. While powerful, rewriting history can disrupt collaboration if not used carefully, especially on shared branches.
💡 Key Takeaways
- Understand what rewriting Git history is and why you might clean up commits (messages, combinations, removing sensitive data).
- Learn how rebase moves or copies a sequence of commits onto a new base and how it differs from merge.
- Use interactive rebase to squash commits, edit messages, or reorder commits for a cleaner history.
- Identify safeguards when rewriting history, such as avoiding public branches, using git push --force-with-lease, and recovering with reflog if something goes wrong.
❓ Frequently Asked Questions
What does rewriting history mean in Git?
Rewriting history means changing past commits—such as messages, content, or order—to clean up mistakes or remove sensitive data, usually before sharing with others.
What is git rebase and what does it do?
Git rebase moves or replays a sequence of commits onto a new base, producing a linear history by placing your work on top of another branch.
What is interactive rebase used for?
Interactive rebase (git rebase -i) lets you edit commits—reword messages, squash or drop commits, and reorder them during the rebase.
When should you avoid rewriting history?
Avoid rewriting history on public or shared branches. Coordinate with teammates and prefer local/feature branches; if you rewrite, you may need to force-push with caution.
How can I safely remove sensitive data from history?
Use tools like BFG Repo-Culler or git filter-branch to purge data from history, then rewrite history and push with care (usually --force-with-lease).